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The normal growth of red meat pomelo requires various nutrient elements, and it requires balanced production and application of various elements in production. The lack of certain elements will cause the tree to malfunction. In severe cases, the growth, fruit and fruit quality will be affected, and even the tree death. However, the content of various elements in the tree must be relatively balanced, otherwise it will cause elemental misalignment. Take potassium and magnesium as examples. Although the content of magnesium in the tree is appropriate, if the potassium is excessive, the tree will suffer from magnesium deficiency. According to research, the imbalance of the elements will exacerbate the occurrence and development of juice granulation, and there is a certain relationship between fruit granulation, fissure valve disease and fruit, leaf, and soil nutrient content. The nutrient content (especially nitrogen, phosphorus, potassium) of the granulation juice of the fruit increased significantly, and the cells of the fissure valve juice also showed an increasing trend. The content of potassium and boron in leaves was positively correlated with the grain index, and the content of copper in the soil was positively different from the grain index. In order to improve the fruit quality and reduce the incidence of cell juice granulation, the grapefruit tree fertilization must be based on farmyard fertilizers, supplemented by inorganic fertilizers, generally requiring organic nitrogen to account for more than 50% of total nitrogen.
In addition, attention should be paid to the use of green manure in the orchard and green manure around the orchard. Promoting natural orchard cultivation in orchards is the simplest and most economical way to increase soil organic matter, and it is worth advocating. At the same time, the application of organic fertilizers should be carried out in conjunction with the deep plowing of the orchards to improve the mature soil layers.
Rational ratio fertilizer
Fertilization is mainly based on farmyard fertilizers, supplemented by inorganic fertilizers, and increases soil organic matter. The content of various elements in the farmyard fertilizer is relatively comprehensive, and commonly used are manure urine, manure, bean cake, pond mud, garbage, green manure, and compost. Farmyard manure mostly uses plant residues and animal manure as fertilizer, with many types, wide sources, and low costs. The organic matter in the soil is mainly derived from plant residues and man-made man-made fertilizers. It also includes soil microorganisms. Organic matter has a close relationship with the formation of soil and fertility. It has great benefits for the maturation of the soil; it has a great influence on the physical and chemical properties of the soil, and the soil aggregate structure, water permeability, water holding capacity, water absorption and buffering properties are all It depends on the content of organic matter; organic matter contains a large number of living organisms in microorganisms, and it is also a source of microbial nutrients and energy; the decomposition of organic matter can gradually liberate various elements, so that the plants get complete nutrients, not easy to lack; the decomposition of organic matter of humic acid to the root system The growth has a stimulating effect; organic matter is a source of carbon dioxide to the soil solution and the atmosphere, and the organic acids decomposed by the organic matter influence the chemical weathering process of the parent material to a large extent. Therefore, soil organic matter content is a comprehensive manifestation of soil fertility. Increasing organic matter content is the focus of orchard soil management. The effect of soil fertilization is often not based on the total amount of fertilization but on the proportion and absolute amount of organic fertilizer applied. The content of organic matter in orchards of hilly red soils is generally low, generally between 1% and 2%.